KR20040030345A - Display unit and its manufacturing method - Google Patents

Abstract

PURPOSE: A display device and a manufacturing method thereof are provided to realize slimness and lightweight by removing a space between a touch panel and a display panel, and enhance an image quality by preventing distortion or bend of the touch panel. CONSTITUTION: The first electrode(12) is formed/etched/patterned to a predetermined shape on a driving substrate(11). A hole injection layer(13A), a hole transfer layer(13B), a luminescent layer(13C), an electron transfer layer(13D), an electron injection layer(13E), and the second electrode(14) are sequentially formed by a deposition method, and organic electro-luminescent elements(10R,10B) are formed. A driving panel is formed by forming a protecting film covering the organic electro-luminescent elements of the driving substrate.

Description

Display device and manufacturing method thereof {DISPLAY UNIT AND ITS MANUFACTURING METHOD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device having a touch panel and a manufacturing method thereof, and more particularly, to a display device using an organic light emitting element and a manufacturing method thereof.

The so-called touch screens in which a touch panel is mounted on a display panel using a cathode ray tube (CRT) or a liquid crystal are widely used in banks and stations. In addition, small touch screens are employed in PDAs (Personal Digital Assistants) and portable terminals.

The general touch panel used for the conventional touch screen has a structure which laminated | stacked the glass substrate and the plastic film, for example. In such a touch panel, the glass substrate side is arrange | positioned facing a display panel so that a plastic film side may become an operation surface. In the case of the liquid crystal display panel, a gap is provided between the glass substrate of the touch panel and the liquid crystal display panel in order to prevent the phenomenon that the image is distorted due to the deformation of the liquid crystal under pressure during operation of the touch panel.

Recently, a touch panel (hereinafter referred to as a "flexible touch panel") having a structure in which two plastic films are laminated has been developed, and this flexible touch panel will make PDAs, portable terminals, etc. thinner and lighter. It is expected. However, since such a flexible touch panel does not have a glass substrate and thus has its own rigidity, the flexible touch panel must be supported by bonding to a display panel. Therefore, since the flexible touch panel cannot have a gap between itself and the display panel as in the touch screen of the conventional liquid crystal display panel, it is difficult to mount the flexible touch panel on the liquid crystal display panel.

In order to solve this problem, it is possible to consider securing a gap in the center by fixing only four sides of the flexible touch panel on the display panel. When such measures are taken for conventional touch panels, when the plastic film is distorted or warped due to contact by fingers or pens, such distortion or warpage can be suppressed or restored by the glass substrate. However, when such measures are taken for flexible touch panels, such distortion or warping is not suppressed or repaired, and there is a problem that image quality may be degraded due to distortion or warpage of the plastic film.

On the other hand, instead of a liquid crystal display, it is possible to consider manufacturing a touch screen by bonding a flexible touch panel to an organic light emitting display. However, there is still a problem that a technique for bonding the flexible touch panel to the entire surface of the organic light emitting display without distortion or warping of the plastic film is not established.

Moreover, in the conventional organic light emitting display, what is called a can sealing structure is generally employ | adopted. The can sealing structure is to apply an adhesive to the periphery of the rear panel, to bond a sealing can made of metal or glass, and to enclose a getter material such as calcium in the space between the panel rear and the sealing can. In an organic light emitting display having such a can sealing structure, there is a limit to reducing the thickness, and at the same time, only four sides of the panel must be fixed to the sealing can, which is particularly useful for touch screens of mobile devices requiring high strength. There is a problem that is difficult to apply.

In view of these problems, it is a first object of the present invention to provide a display device and a method of manufacturing the same, which can realize a thinner and lighter weight by eliminating the gap between the touch panel and the display panel.

Another object of the present invention is to provide a display device and a method of manufacturing the same which can improve image quality by preventing distortion or warping of the touch panel.

1 is a cross-sectional view showing a configuration of a display device according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing the configuration of an organic layer in the organic light emitting element shown in FIG.

FIG. 3 is an enlarged cross-sectional view showing the configuration of an organic layer in the organic light emitting element shown in FIG. 1; FIG.

4A and 4B are sectional views showing the manufacturing method of the display device shown in FIG. 1 in the order of steps.

FIG. 5 is a sectional view of a process following FIG. 4A and FIG. 4B. FIG.

6A and 6B are explanatory diagrams showing a process following FIG. 5;

7A to 7C are explanatory diagrams showing a method of manufacturing a display device according to a modification of the present invention.

8 is a cross-sectional view showing a configuration of a display device according to a second embodiment of the present invention.

9A and 9B are explanatory diagrams showing a method of manufacturing a display device according to a modification of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: display panel

10R, 10G, 10B: organic light emitting device

11: driving substrate

11A: passivation film (passivation film)

12: first electrode

13: organic membrane

13A: electron hole injection layer

13B: Electron Hole Transport Layer

13C: light emitting layer

13D: Electron Transport Layer

13E: electron injection layer

14: second electrode

20: touch panel

21: lower plastic film

21A, 22A: transparent electrode

22: touch-side plastic film

30, 60: adhesive layer

40: drive panel

50: sealing panel

51: sealing substrate

52: color filter

52R: Red Filter

52G: Green Filter

52B: Blue Filter

70: touch panel holding plate

80: roller

91: frame

92 mesh

A display device according to the present invention includes a display panel including a substrate on which display elements are formed, and a touch panel bonded directly to the entire surface of the display panel by an adhesive layer interposed therebetween and detecting a touch by a finger or a pen. .

According to an aspect of the present invention, there is provided a method of manufacturing a display device, the method including: forming a display panel including a substrate on which display elements are formed; By direct bonding together.

In the display device and the manufacturing method thereof according to the present invention, the touch panel and the entire surface of the display panel are directly bonded together by the interposed adhesive layer. Therefore, there is no gap between the touch panel and the display panel, and the display device is thinned.

Here, it is preferable that a display panel has the sealing board | substrate arrange | positioned facing the display element side of a board | substrate, and the whole surface of a board | substrate and a sealing board is joined together by the adhesive layer interposed. By doing so, the intensity of the display panel is increased, thereby obtaining a display device suitable for a mobile device which requires a touch screen and requires high intensity.

Suitable touch panels are, for example, touch panels having a structure in which two plastic films on which each transparent electrode is formed are laminated so that the transparent electrodes face each other. This is because the thickness and weight of the display device are further reduced. Another reason is that even when the touch panel is a touch panel with low strength, when distortion or warp occurs in the plastic film due to contact with the finger or the pen, the touch or the warp is suppressed or restored by the display panel so that the warp or warp is suppressed. This is because the panel is supported by the display panel.

Moreover, a suitable display element is an organic light emitting element which has an organic layer containing a light emitting layer between a 1st electrode and a 2nd electrode, and takes out the light generate | occur | produced in the light emitting layer from the 2nd electrode side. In the structure of the present invention, since the organic light emitting device does not have a blooming phenomenon as in liquid crystal, the touch panel and the display panel can be directly bonded without forming a gap between the touch panel and the display panel. Therefore, the high picture quality can be realized by the structure of the present invention.

Further objects, features and advantages of the invention will appear in more detail from the following description.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[First Embodiment]

1 illustrates a cross-sectional structure of a display device according to a first embodiment of the present invention. Such a display device is used as an ultra-thin organic light emitting color display device, for example, and the touch panel 20 is attached to the entire surface of the display device 10 by the adhesive layer 30.

In the display device 10, for example, the driving panel 40 and the sealing panel 50 are disposed to face each other, and the entire surfaces of both panels 40 and 50 are joined by the adhesive layer 60.

The driving panel 40 includes, for example, an organic light emitting element 10R emitting red light, an organic light emitting element 10G emitting green light, and the like on a driving substrate 11 made of an insulating material such as glass, The organic light emitting element 10B emitting blue light has a configuration provided as a whole in a matrix state in order. In addition, the driving substrate 11 is provided with a protective film 11A (passivation film) to prevent moisture or the like from entering the organic light emitting elements 10R, 10G, and 10B.

In the organic light emitting elements 10R, 10G, and 10B, for example, the first electrode 12 as an anode, the organic layer 13, and the second electrode 14 as a cathode are sequentially in order from the driving substrate 11 side. Are stacked. On the second electrode 14, a protective film 11A is formed.

It is preferable that the first electrode 12 also has a function as a reflective layer, and has as high a reflectance as possible in order to increase luminous efficiency. For example, the material constituting the first electrode 12 is simple of a metal element having a high work function such as platinum (Pt), gold (Au), silver (Ag), chromium (Cr), tungsten (W), or the like. substance) or alloys. The thickness (hereinafter simply referred to as "thickness") in the stacking direction of the first electrode 12 is preferably 100 nm to 300 nm. For example, as the alloying material, an AgPdCu alloy containing silver and containing 0.3% by mass to 1% by mass of palladium (Pd) and 0.3% by mass to 1% by mass of copper (Cu) may be used.

The configuration of the organic layer 13 changes depending on the light emission color of the organic light emitting element 10. 2 shows an enlarged view of the configuration of the organic layer 13 in the organic light emitting elements 10R and 10B. The organic layer 13 of the organic light emitting elements 10R and 10B includes an electron hole injection layer 13A, an electron hole transport layer 13B, a light emitting layer 13C, an electron transport layer 13D, and an electron injection layer 13E. ) Is laminated in order from the first electrode 12 side. The function of the electron hole injection layer 13A and the electron hole transport layer 13B is to improve the electron hole injection efficiency into the light emitting layer 13C. The function of the light emitting layer 13C is to generate light by current injection. The function of the electron transport layer 13D and the electron injection layer 13E is to improve the electron injection efficiency to the light emitting layer 13C.

The electron hole injection layer 13A of the organic light emitting element 10R has a thickness of about 30 nm, for example, and is composed of 4, 4 ', 4 "-tris (3-methylphenyl phenyl amino) tri-phenyl amine (MTDATA). The electron hole transport layer 13B of the organic light emitting element 10R has a thickness of, for example, about 30 nm and is composed of bis [(N-naphthyl) -N-phenyl] benzidine (α-NPD). The light emitting layer 13C of the element 10R has a thickness of about 50 nm, for example, 2,5-bis [4- [N- (4-methoxyphenyl) -N-phenylamino]] stilbenzene-1, 4-deca-bonnitrile (BSB) The electron transport layer 13D of the organic light emitting element 10R has a thickness of about 30 nm, for example, and consists of 8-quinolinol aluminum composite (Alq). The electron injection layer 13E of the organic light emitting element 10R has a thickness of about 1 nm, for example, and is made of lithium fluoride (LiF).

For example, the electron hole injection layer 13A of the organic light emitting element 10B has a thickness of about 30 nm and is composed of MTDATA. For example, the electron hole transport layer 13B of the organic light emitting element 10B has a thickness of about 30 nm and is composed of α-NPD. For example, the light emitting layer 13C of the organic light emitting element 10B has a thickness of about 30 nm and is composed of spiro 6Φ. The electron transport layer 13D of the organic light emitting element 10B has a thickness of about 30 nm and consists of Alq. For example, the electron injection layer 13E of the organic light emitting element 10B has a thickness of about 1 nm and is composed of lithium fluoride (LiF).

3 is an enlarged view of the configuration of the organic layer 13 in the organic light emitting element 10G. The organic layer 13 of the organic light emitting element 10G has an electron hole injection layer 13A, an electron hole transport layer 13B, a light emitting layer 13C and an electron injection layer 13E from the first electrode 12 side. It has a structure laminated in this order. The light emitting layer 13C also functions as an electron transporting layer.

For example, the electron hole injection layer 13A of the organic light emitting element 10G has a thickness of about 30 nm and is composed of MTDATA. For example, the electron hole transport layer 13B of the organic light emitting element 10G has a thickness of about 30 nm and is composed of α-NPD. The light emitting layer 13C of the organic light emitting element 10G has a thickness of about 60 nm and is composed of Alq. For example, the electron injection layer 13E of the organic light emitting element 10G has a thickness of about 1 nm and is composed of lithium fluoride (LiF).

For example, the second electrode 14 shown in FIGS. 1 to 3 has a thickness of 1 nm to 50 nm, and may be aluminum (Al), magnesium (Mg), calcium (Ca), sodium (Na), or the like. It consists of a single element or alloy of metallic elements with a low work function. Specifically, an alloy of magnesium and silver (MgAg alloy) is preferable, and the mass ratio of magnesium and silver is preferably Mg: Ag = 5: 1 to 20: 1.

The second electrode 14 also has a function as a semitransparent reflective layer. That is, such organic light emitting elements 10R, 10G, and 10B have the end face of the first electrode 12 on the light emitting layer 13C side as the first end P1, and the second electrode on the light emitting layer 13C side. The end face of 14 is regarded as the second end P2 and the organic layer 13 as the resonant portion, and the light generated in the light emitting layer 13C is resonated and taken out from the second end P2 side. Has a resonator structure. Such a resonator structure is preferable because light generated in the light emitting element 13C causes multiple interference, and acts as a kind of narrowband filter, so that half of the bandwidth of the spectrum of the extracted light is reduced, thereby improving color purity. In addition, such a resonator structure can likewise allow external light incident from the sealing panel 50 to be attenuated by multiple interferences, and the organic light emitting elements 10R and 10G by combination with a color filter 52 (see Fig. 1) described later. And the reflectance of the external light in 10B) can be extremely low.

In order to achieve the above effect, the optical distance L between the first end P1 and the second end P2 of the resonator satisfies Equation 1, and the resonant wavelength of the resonator (peak wavelength of the spectrum of the extracted light). Is preferably coincident with the peak wavelength of the spectrum of light to be extracted. In practice, it is preferable that the optical distance L is selected so that the optical distance L is a minimum value of a quantity satisfying the equation (1).

(2L) / λ + Φ / (2π) = m

(In the above equation, L denotes an optical distance between the first end P1 and the second end P2, and Φ represents the phase shift of the reflected light generated at the first end P1 and the second end P2. rad), and λ represents the peak wavelength of the spectrum of the light extracted from the second end P2, and m represents an integer such that L is a positive number, where L and λ are equal to (nm). Share a common unit)

The sealing panel 50 shown in FIG. 1 has a sealing substrate 51 for sealing the organic light emitting elements 10R, 10G, and 10B together with the adhesive layer 60. The sealing substrate 51 is made of a material such as glass through which light generated by the organic light emitting elements 10R, 10G, and 10B is transmitted. For example, the sealing substrate 51 includes a color filter 52, extracts light generated from the organic light emitting elements 10R, 10G, and 10B, and the organic light emitting elements 10R, 10G, and 10B and the space therebetween. Absorbs external light reflected from the wiring and improves contrast.

The color filter 52 may be disposed on one surface of the sealing substrate 51. However, the color filter 52 is preferably disposed on the drive panel 40 side. This is because the color filter 52 is not exposed at the surface and a structure in consideration of the antiweatherability of the color filter 52 can be obtained. Another reason is that when the display panel 10 and the touch panel 20 are bonded, problems such as nonuniformity in the touch panel 20 can be prevented. The color filter 52 has a red filter 52R, a green filter 52G, and a blue filter 52B, which are arranged in order corresponding to the organic light emitting elements 10R, 10G, and 10B.

For example, the red filter 52R, the green filter 52G, and the blue filter 52B are each formed in a rectangular shape without a space therebetween. The red filter 52R, the green filter 52G and the blue filter 52B are each made of a resin mixed with a pigment, and by selecting the pigment, the light transmittance in the wavelength bands of the desired red, green and blue is high. In other wavelength bands, the light transmittance is adjusted to be low.

In addition, the wavelength range with high light transmittance in the color filter 52 coincides with the peak wavelength? Of the spectrum of light extracted from the resonator structure. Therefore, from the external light incident from the sealing panel 50, only light having the same wavelength as the peak wavelength [lambda] of the spectrum of the light to be extracted passes through the color filter 52, and the external light having other wavelengths is organic light emission. Intrusion into the elements 10R, 10G, and 10B is prevented.

For example, the protective film 11A shown in FIG. 1 is made of silicon oxide (SiO ₂ ), silicon nitride (SiN _x ), or the like. The function of the protective film 11A is to prevent oxygen, moisture, and the like from entering the organic light emitting elements 10R, 10G, and 10B.

For example, the touch panel 20 shown in FIG. 1 is laminated through a spacer (not shown) between the lower plastic film 21 and the touch-side plastic film 22, and is mounted on the driving substrate 11. It has a structure arrange | positioned on the sealing board 51 of the opposite side. For example, in order to detect contact with the touch-side plastic film 22 by a finger or a pen in the touch panel 20, the lower plastic film 21 is provided with a transparent electrode 21A, and the touch-side plastic film 22 is provided with a transparent electrode 22A. The lower plastic film 21 and the touch-side plastic film 22 are laminated so that the transparent electrodes 21A and 22A are disposed to face each other. The transparent electrodes 21A, 22A are connected to a control system, not shown, via a flexible connector, not shown, and the like.

For example, such a display device can be manufactured as follows.

4A and 4B and 6A and 6B show the manufacturing method of this display device in the order of process. First, as shown in Fig. 4A, a first electrode 12 made of the material described above is formed on the driving substrate 11 made of the material described above, for example by DC sputtering, to a thickness described above. And selectively etch using, for example, lithography techniques, and patterning into desired shapes. Then, as shown in Fig. 4A, the electron hole injection layer 13A, the electron hole transport layer 13B, the light emitting layer 13C, and the electron transport layer 13D having the above thickness and made of the above-mentioned material. The electron injection layer 13E and the second electrode 14 are sequentially formed by, for example, a vapor deposition method, and the organic light emitting elements 10R, 10G, and 10B as shown in Figs. 2 and 3 are formed. Thereafter, as shown in FIG. 4A, a protective film 11A made of the above-described material is formed so as to cover the organic light emitting elements 10R, 10G, and 10B of the driving substrate 11. As a result, the drive panel 40 is formed.

As shown in Fig. 4B, for example, the material of the red filter 52R is applied by a spin coating method on a sealing substrate 51 made of the material described above, and fired by patterning by photolithography technology. The red filter 52R is formed. Then, as shown in Fig. 4B, the blue filter 52B and the green filter 52G are sequentially formed in the same manner as the red filter 52R. As a result, the sealing panel 50 is formed.

Subsequently, as shown in FIG. 5, the adhesive layer 60 is formed on the protective film 11A, and the sealing substrate 51 having the color film 52 is formed on the organic light emitting element of the driving substrate 11. It is arrange | positioned facing the side of (10R, 10G, 10B), and the whole surface of the drive substrate 11 and the sealing substrate 51 is bonded by the adhesive layer in between. At this time, it is preferable that the side of the sealing panel 50 in which the color filter 52 is formed is disposed facing the drive panel 40. Thus, the display panel 10 is formed.

Thereafter, as shown in FIGS. 6A and 6B, an adhesive layer 30 is formed on the display panel 10, and the entire surface of the touch panel 20 and the display panel 10 are attached to the adhesive layer therebetween. Join with (30). At this time, as shown in FIG. 6A, the touch panel 20 is attached to the touch panel holding plate 70 and a roller 80 is applied to one side of the touch panel 20. 6B, the touch panel 20 and the display panel 10 are bonded to each other by the pressure generated by the rotational movement of the roller 80. At this time, the touch panel 20 is slid on the touch panel holding plate 70 by moving the touch panel holding plate 70 in the direction of the arrow A in synchronism with the roller 80. Therefore, the touch panel 20 and the display panel 10 can be bonded together without mixing bubbles in the adhesive layer 30. Thus, the display device shown in FIGS. 1 to 3 is completed.

In this display device, when a predetermined voltage is applied between the first electrode 12 and the second electrode 14, current is injected into the light emitting layer 13C, electron holes and electrons recombine, and mainly the light emitting layer ( Light emission occurs at the interface of 13C). Such light is multiplely reflected between the first electrode 12 and the second electrode 14, and the second electrode 14, the protective film 11A, the color filter 52, the sealing substrate 51, and the touch panel. It penetrates 20 and is taken out. When the finger or the fan comes into contact with the touch-side plastic film 22, the touch panel 20 detects this contact. At this time, in this embodiment, since the entire surfaces of the touch panel 20 and the display panel 10 are directly bonded together by the adhesive layer 30 therebetween, the panel 20 is connected by the display panel 10. It is supported, and even if a finger or a fan contacts the touch panel 20, no distortion or warping occurs in the touch panel 20, and the image quality is improved.

As described above, according to the present embodiment, since the entire surfaces of the touch panel 20 and the display panel 10 are directly bonded by the adhesive layer 30 therebetween, the touch panel 20 and the display panel 10 are bonded. There is no gap between), and the thickness of the display device can be reduced.

In particular, since the display panel 10 is bonded together with the entire surface of the driving substrate 11 and the sealing substrate 51 with the adhesive layer 60 therebetween, the strength of the display panel 10 is increased. Therefore, this display device is very suitable as a display device of a mobile device requiring a touch screen and requiring high intensity.

In addition, the touch panel 20 has the lower plastic film 21 with the transparent electrode 21A formed thereon and the touch side plastic film 22 with the transparent electrode 22A formed so that the transparent electrodes 21A, 22A face each other. It is a flexible touch panel which has a laminated structure. Therefore, the thickness and weight of the display device can be further reduced. In addition, even if the touch panel 20 is a touch panel having low rigidity, since the touch panel 20 is supported by the display panel 10, the touch panel 20 is distorted in the touch-side plastic film 22 due to contact with a finger or a fan. Alternatively, when warpage or the like occurs, such distortion or warpage may be suppressed or restored by the display panel 10.

Further, in particular, when the touch panel 20 and the display panel 10 are bonded together with the adhesive layer 30 therebetween, the roller 80 is applied to one side of the touch panel 20 to move the roller 80. Since the pressing force is applied by the rotation, the touch panel 20 and the display panel 10 can be bonded to each other without bubbles mixed in the adhesive layer 30. As a result, the deterioration of the organic light emitting elements 10R, 10G, and 10B due to oxygen or moisture in the bubbles can be prevented, so that the image quality can be improved.

[Modification]

7A and 7B show a modification of the method of manufacturing the display device according to the first embodiment. In this modification, the touch panel 20 is bent in advance with the surface bonded to the adhesive layer 30 outward, and is pressed by the roller 80 from the other surface.

First, the display panel 10 is formed in the same manner as the method shown in Figs. 4A, 4B and 5 of the first embodiment. Subsequently, as shown in FIG. 7A, the touch panel 20 is turned outward with the lower plastic film 21 bonded to the adhesive layer 30 outward, for example, in a substantially U-shape using a roll (not shown) or the like. Bend.

Next, as shown in FIG. 7B, the adhesive layer 30 is formed on the display panel 10, and one end 20A of the touch panel 20 that is curved in a U shape in advance is displayed on the display panel 10. The roller 80 is applied to the one end 20A. At this time, the roller 80 is applied to the touch-side plastic film 22 of the touch panel 20.

Thereafter, as shown in FIG. 7C, the roller 80 is rotated and moved to press the touch panel 20 by the roller 80 from the side of the touch-side plastic film 22 to thereby touch the touch panel 20 and the touch panel 20. The display panel 10 is bonded together. Thereby, a force is applied in the tensioning direction which makes the touch side plastic film 22 smooth. Therefore, at the time of bonding and operation, distortion or warpage do not occur in the touch-side plastic film 22. In this way, the display device shown in FIGS. 1 to 3 is completed.

As mentioned above, in this modification, the lower plastic film 21 bonded to the adhesive layer 30 is bent in advance to the outside, and the display panel 10 is rolled from the side of the touch-side plastic film 22. Since the touch panel 20 and the display panel 10 are bonded by pressing the touch panel 20 by the 80, the force in the tensile direction in which the touch-side plastic film 22 of the touch panel 20 is smoothed. Is applied. Therefore, at the time of bonding and operation, distortion or warpage do not occur in the touch-side plastic film 22, and image quality can be improved.

Second Embodiment

8 illustrates a cross-sectional structure of a display device according to a second embodiment of the present invention. This display device is the same as the display device shown in the first embodiment except that the display panel 10 is composed of only the drive panel 40 and not provided to the sealing panel 50 and the adhesive layer 10. . Therefore, the same code | symbol is attached | subjected to the same component and detailed description is abbreviate | omitted.

The touch panel 20 is bonded to the entire surface by the adhesive layer 30 therebetween on the side where the organic light emitting elements 10R, 10G, and 10B of the driving substrate 11 are formed. The light emitting elements 10R, 10G, and 10B are sealed by the touch panel 20. Therefore, since the sealing panel 50 (see FIG. 1) and the adhesive layer 60 are omitted, the thickness and weight of the display device are further reduced. In addition, since the organic light emitting elements 10R, 10G, and 10B are reliably sealed by the protective film 11A, the adhesive layer 30, and the touch panel 20, deterioration due to intrusion of moisture or oxygen is prevented.

The manufacturing method of the display device of this embodiment is the same as that of the first embodiment except that the adhesive layer 30 is formed on the protective film 11A to bond the touch panel 20 and the display panel 10 together. similar. Its operation is similar to that of the first embodiment.

As described above, since the sealing panel 50 is not provided in this embodiment, since the organic light emitting elements 10R, 10G, and 10B are sealed by the touch panel 20, the thickness and weight of the display device are further reduced. do. In addition, since the organic light emitting elements 10R, 10G, and 10B are securely sealed by the protective film 11A, the adhesive layer 30, and the touch panel 20, deterioration due to invasion of moisture or oxygen is prevented.

Although the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments, and various modifications may be made. For example, the material, thickness, deposition method, and deposition conditions for the respective layers are not limited to those described in the above embodiments, and other materials, thicknesses, deposition methods, and deposition conditions may be applied.

For example, in the first embodiment, the touch panel 20 is attached to the touch panel holding plate 70. However, as shown in FIGS. 9A and 9B, instead of the touch panel retaining plate 70, it is attached to a mesh 92 extending between the frames 91 to the roller 80 through the mesh 92. The touch panel 20 is pressed. This method is preferable because the bending angle of the touch panel 20 is small and the load on the touch panel 20 is small.

In addition, in the second embodiment, the case where the touch panel 20 having the structure in which the lower plastic film 21 and the touch-side plastic film 22 are laminated is described. However, when the sealing panel 50 is omitted as described above, a conventional touch panel using a glass substrate instead of the lower plastic film 21 is used to improve the strength of the display device.

In addition, the above modification can be applied not only to the first embodiment but also to the second embodiment. Thus, it is possible to realize a thinner and lighter display device.

In addition, for example, in the touch panel 20, various driving methods such as a resistive film type, a capacitive type, an optical type, an ultrasonic type, and an electromagnetic induction type may be used.

In addition, for example, in relation to the configuration of the organic light emitting elements 10R, 10G, and 10B, the order of lamination is the second electrode 14, the organic layer 13, and the first electrode 12, in contrast to the above embodiments. ) Can be sequentially stacked on the driving substrate 11 from the driving substrate 11 side, and light can be taken out from the driving substrate 11 side. In this case, the touch panel 20 is disposed on the driving substrate 11 on the side opposite to the organic light emitting elements 10R, 10G, and 10B.

For example, in the above embodiments, the case where the first electrode 12 is used as the anode and the second electrode 14 is used as the cathode has been described. However, it is also possible to reverse the anode and cathode in such a way that the first electrode 12 is the cathode and the second electrode 14 is the cathode. In addition, while using the first electrode 12 as the cathode and the second electrode 14 as the anode, the second electrode 14, the organic layer 13, and the first electrode 12 form a driving substrate ( It is also possible to laminate | stack on the drive board 11 one by one from the 11) side, and to extract light from the drive board 11 side.

In addition, in the above embodiments, the configuration of the organic light emitting device has been described in detail. However, not all layers are necessarily provided, and other layers may be further provided. For example, the first electrode 12 may have a two-layer structure in which a transparent conductive film is laminated on top of a dielectric multilayer film or a reflective film such as Al. In this case, the end face of the reflective film on the light emitting layer side constitutes an end portion of the resonator portion, and the transparent conductive film constitutes a part of the resonator portion.

In addition, in the above embodiments, the case where the second electrode 14 is composed of a semi-transparent reflective layer has been described. However, the second electrode 14 may have a structure in which the semi-transmissive reflective layer and the transparent electrode are sequentially stacked from the first electrode 12 side. The function of this transparent electrode is to lower the electrical resistance of the semipermeable reflective layer. The transparent electrode is made of a conductive material having sufficient light transmittance to light generated in the light emitting layer. As a material constituting the transparent electrode, for example, a compound containing ITO or indium, zinc (Zn) and oxygen is preferable because good conductivity can be obtained by using these materials even when the film is formed at room temperature. The thickness of the transparent electrode can be, for example, 30 nm to 1,000 nm.

Further, in the above embodiments, the case where the organic light emitting elements 10R, 10G, and 10B are formed on the driving substrate 11 has been described. However, the present invention can be applied to displays in which other display elements such as inorganic electroluminescent elements are formed on the driving substrate 11, FED (field emission display), or paper type displays that are recently attracting attention.

As described above, according to the display device of the present invention or the manufacturing method of the display device of the present invention, the gap between the touch panel and the display panel, because the entire surface of the touch panel and the display panel are directly bonded together through the adhesive layer. In this way, the thickness of the display device can be reduced.

According to the display device of one aspect of the present invention or the manufacturing method of the display device of one aspect of the present invention, the display panel has a sealing substrate disposed opposite to the display element side of the substrate, and the entire surface of the substrate and the sealing substrate is Since they are bonded together by the adhesive layer between them, the strength of the display panel is improved. Accordingly, the present display device is very suitable as a display device of a mobile device in which a touch screen is essential and requires high intensity.

According to the display device of another aspect of the present invention or the manufacturing method of the display device of another aspect of the present invention, since the touch panel has a structure in which two plastic films on which individual transparent electrodes are formed are laminated so that the transparent electrodes face each other, The thickness and weight of the device is further reduced. Moreover, even if the touch panel is a touch panel having low rigidity, the touch panel is supported by the display panel. Therefore, when distortion or warpage occurs in the plastic film by contact with a finger or a pen, such distortion or warpage is suppressed or restored by the display panel.

According to the display panel of another aspect of the present invention or the manufacturing method of the display panel of another aspect of the present invention, since the touch panel is provided on the side where the display element of the substrate is formed and the display element is sealed by the touch panel, The thickness and weight of the device can be further reduced. In addition, since the display element is reliably sealed by the adhesive layer and the touch panel, deterioration can be prevented.

According to a method of providing a display device of another aspect of the present invention, when the touch panel and the display panel are bonded together by an adhesive layer therebetween, one side of the touch panel touches the roller and the pressure is reduced by the rotational movement of the roller. Since applied, the touch panel and the display panel can be bonded together without incorporation of bubbles into the adhesive layer. Therefore, deterioration of the display element due to oxygen or moisture of bubbles can be prevented, and image quality can be improved.

According to the manufacturing method of the display device of another aspect of the present invention, when the touch panel is pressed by a roller, the touch panel is previously curved with the surface bonded to the adhesive layer outward, and the touch panel is on the other side, that is, the finger. Alternatively, since the pen is pressed by the roller from the contacting side, a force is applied to the surface where the finger or the pen contacts, in the tensioning direction to make it flat. Therefore, no distortion or warpage occurs on the surface contacted by the finger or the pen during bonding, and image quality is improved.

Obviously many modifications and variations of the present invention are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims, the invention may be practiced in other ways than specifically described.

Claims (14)

A display panel including a substrate on which display elements are formed; And a touch panel which is directly bonded to the entire surface of the display panel by an adhesive layer interposed therebetween and which detects contact by a finger or a pen. The display device according to claim 1, wherein the touch panel is provided on a side where a display element of the substrate is formed, and the display element is sealed by the touch panel. The display device of claim 1, wherein the touch panel has a structure in which two plastic films on which transparent electrodes are formed are laminated so that the transparent electrodes face each other. The display panel of claim 1, wherein the display panel has a sealing substrate disposed opposite to the display element side of the substrate, and the entire surface of the substrate and the sealing substrate are bonded together by an interposed adhesive layer. Display device. The display device of claim 4, wherein the touch panel is provided on the sealing substrate opposite to the substrate. The display device of claim 1, wherein the display device has an organic layer including a light emitting layer between the first electrode and the second electrode, and extracts light generated from the light emitting layer from the second electrode side. Display device characterized in that. Forming a display panel including a substrate on which display elements are formed; And directly bonding together the touch panel for detecting contact by a finger or a pen and the entire surface of the display panel with an adhesive layer interposed therebetween. The method of manufacturing a display device according to claim 7, wherein the touch panel is provided on a side where a display element of a substrate is formed, and the display element is sealed by the touch panel. The method of claim 7, wherein the touch panel has a structure in which two plastic films each having a transparent electrode formed thereon are laminated so that the transparent electrodes face each other. The method of claim 7, wherein in the forming of the display panel, a sealing substrate is disposed on a side of a display element of the substrate, and the entire surface of the substrate and the sealing substrate are joined together by an adhesive layer interposed therebetween. The manufacturing method of the display apparatus characterized by the above-mentioned. The method of manufacturing a display device according to claim 10, wherein the touch panel is provided on the sealing substrate opposite to the substrate. 8. An organic light emitting element according to claim 7, wherein, as the display element, an organic layer including a light emitting layer is provided between the first electrode and the second electrode, and light emitted from the light emitting layer is extracted from the second electrode side. Forming a display device; The method of claim 7, wherein the roller is applied to one side of the touch panel, and the touch panel and the display panel are bonded together by the pressing force generated by the rotational movement of the roller. . The method according to claim 13, wherein when pressing the touch panel with the roller, the touch panel is bent in advance with the surface bonded to the adhesive layer outward, and pressing the touch panel with the roller from the other surface side. The manufacturing method of the display apparatus characterized by the above-mentioned.